C(=O)(O)[O-].[Na+].Cl.[NH2:7][OH:8].[C:9]([O:13][C:14](=[O:24])[NH:15][C:16]([C:22]#[N:23])([CH3:21])[CH2:17][CH:18]1[CH2:20][CH2:19]1)([CH3:12])([CH3:11])[CH3:10]>O.C(O)C>[C:9]([O:13][C:14](=[O:24])[NH:15][C:16]([C:22](=[NH:23])[NH:7][OH:8])([CH3:21])[CH2:17][CH:18]1[CH2:19][CH2:20]1)([CH3:10])([CH3:12])[CH3:11]Sodium bicarbonate (247.52 mg, 2.94 mmol) was dissolved in water (2 mL) and hydroxylamine hydrochloride (204.747 mg, 2.94 mmol) was added. A solution of (1-cyano-2-cyclopropyl-1-methyl-ethyl)-carbamic acid tert-butyl ester (600 mg, 2.69 mmol) in ethanol (10 mL) was added thereto and the resulting reaction mixture was heated at 80° C. for 12 hours. After evaporation of solvents, the residue was dissolved with ethyl acetate (20 mL) and then filtered. The filtrate was concentrated in vacuo. The residue was purified by chromatography (silica gel, 25 g, 3:7 ethyl acetate/n-hexane) to give the title compound (450 mg, 66%) as white solid; LC-MS (UV peak area, ESI) 100%, 258.4 (M+H).
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